Study, study, study and remember that equation because that's the most important thing about it. You should know how to graph the points out and pinpoint which number goes where. Other than that, watch Khan Academy videos! They're very helpful... or read an article.
An exponential function can describe growth or decay
It gets rapidly smaller as x increases, as illustrated by its graph. In the exponential growth of f(x), the function doubles every time you add one to its input x.
